Fan Cheng

Chinese Academy of Engineering

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Liangzhong Yao

Wuhan University

Lijun Xie

China Electric Power Research Institute

Beilin Mao

Wuhan University

Yan Li

North China Electric Power University

Jing Wu

China Power Engineering Consulting Group (China)

Jian Xu

Wuhan University

Jingjing Wang

Qingdao University of Science and Technology

Qingsheng Li

Guizhou Electric Power Design and Research Institute

Wenxia Liu

Guizhou Electric Power Design and Research Institute

Zhen Li

Tsinghua University

Cooperative Institutions

Wuhan University

North China Electric Power University

China Electric Power Research Institute

Guizhou Electric Power Design and Research Institute

State Grid Corporation of China (China)

Shanghai Jiao Tong University

University of Science and Technology Beijing

Nanjing University of Aeronautics and Astronautics

Electric Power Research Institute

Huazhong University of Science and Technology

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A comprehensive review of wind power based power system frequency regulation

Frontiers in Energy (2023)

Wen Zhang Liangzhong Yao Fan Cheng Jian Xu Beilin Mao

Frequency Regulation

Combing

10.1007/s11708-023-0876-6

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Citations (5)

Generation expansion planning for Guizhou province based on the complementary characteristics of wind and solar

Energy Reports (2022)

Qingsheng Li Yu Zhang Fan Cheng Liangzhong Yao Yeyan Xu

With the growth of wind power and solar power, power source clean transformation has become a feasible way for achieving the carbon peak target. As a hydropower resource-abundant province, Guizhou has already built Wujiang river cascade hydropower plants. This paper introduces the basic information of the Guizhou provincial power system and geometrical renewable resource distribution characteristics, especially the power source structure. Then, the wind and solar power complementary characteristics are analyzed by different copula conjunction functions. Then, the power structure transformation and generation expansion plan are provided with both carbon peak restriction and curtailment restrictions. At last, the future Guizhou provincial power system in 2029 operation simulation cases are provided, which can reduce the thermal power generation ratio to 42% and increase wind and solar power generation ratio to 8.5% and 13% approximately. The conclusion indicates that coal-fired power plant flexible reform and larger capacity energy storage installation effectively solve the larger power fluctuation and peak regulation demand with more renewable energy integration target.

Solar Power

10.1016/j.egyr.2022.09.210

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The analytical model of modular multilevel converter based on the harmonic balance theory

Energy Reports (2020)

Lijun Xie Liangzhong Yao Fan Cheng Yan Li Chengxi Liu

This paper proposes an analytical model for the modular multilevel converter (MMC) based on the theory of harmonic balance, which removes the iteration process for traditional models. The proposed model considers dynamic harmonic interactions between the modulation of converters and passive elements in the MMC. By transferring the equations into frequency-domain as complex Fourier series, a steady-state harmonic model is created with singular coefficients matrix. Then, through the elimination of all DC components in dynamic model, the singular coefficient matrix can be derived to nonsingular one, and the order of it can be reduced. Finally, the typical open-loop analytical model with DC neutral grounded MMC is derived aim, and the time-domain simulations is used to validate the effectiveness of proposed model. The proposed model can be used to accelerate the simulation and analyze the influence of parameters to guide the design of MMC.

Harmonic balance

Harmonic

Harmonic Analysis

Matrix (chemical analysis)

10.1016/j.egyr.2020.11.229

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Control Strategy for Offshore Wind Farms with DC Collection System Based on Series-Connected Diode Rectifier

Sustainability (2022)

Lijun Xie Fan Cheng Jing Wu

The DR-HVDC (Diode rectifier-based HVDC) transmission topology was recently proposed for integration on large offshore wind farms due to its low investment cost and high reliability. To further reduce the investment, a DC collection topology based on the series-connected diode rectifiers (DR) is proposed, where no offshore platform is needed. However, units of series-connected topology (SCU) show coupling issues, such as overvoltage, energy curtailment, and fault isolation. First, the coupling mechanism is analyzed, and a suitable operation mode for SCUs is selected to ensure the safe operation of the DC system. Then, the linear relationship of active power and output DC current and DC voltage of SCUs is analyzed, and a novel coordinate control strategy for DC wind farms is proposed, where an onshore converter adapts a DC current controller and wind turbines adapt a mediate output voltage control strategy. The mediate output voltage control strategy includes a triple loop with power loop, mediate output voltage loop, and current loop. Also, the DC open line fault, DC grounding fault, and AC grounding fault of the onshore grid are investigated, and a protection strategy is proposed. A 160 MW wind farm with a DR-SCU DC collection system is built in PSCAD/EMTDC to verify the validity of the proposed control strategy under unequal wind speeds, DC fault, and onshore AC fault, and the results validate the performance of the proposed strategy.

Rectifier (neural networks)

Overvoltage

10.3390/su14137860

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Citations (4)

Distributed optimization strategy for networked microgrids based on network partitioning

Applied Energy (2024)

Jingjing Wang Liangzhong Yao Jun Liang Jun Wang Fan Cheng

10.1016/j.apenergy.2024.124834

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Citations (1)

Control strategy of series–parallel DC wind farm with fault isolation

Energy Reports (2022)

Lijun Xie Fan Cheng Zhengang Lu Jing Wu Chao Ding

The series–parallel DC wind farm composed of a large number of DC wind turbine (DCWT) is a potential scheme for offshore wind power collection with lower construction costs and power losses. However, enhanced coupling issues, such as energy curtailment and fault isolation, exist in the DC wind farm. To overcome the difficulties, a series–parallel DC collection system is proposed, where DCWTs based on the single active bridge (SAB) are connected in series and then are connected in parallel via DC/DC converters. The coupling mechanism among series–parallel strings is analyzed first, and a coordinate control strategy for the whole system is proposed based on the characteristics of SAB. DC fault located at different strings is analyzed and strategies are proposed to protect the whole system. Simulation results in PSCAD/EMTDC verifies the proposed control strategy with the less coupling among series–parallel DC wind farms under unequal wind speeds and fault.

Power optimizer

10.1016/j.egyr.2022.08.260

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A survey on development and prospect of wind turbines virtual synchronous control technology

Energy Reports (2021)

Jianzu Hu Yongning Chi Xinshou Tian Yan Li Yu Xiao

The ongoing energy revolution has led to the gradual replacement of traditional synchronous generators by renewable enecorresponding authorrgy. This transformation of power generation mode reshapes power system dynamics and poses many challenges to reliable and efficient grid operation. With the continuous improvement of the penetration level of renewable energy represented by wind power in the power system, the synchronous mode of wind turbine will gradually become one of the main modes of system synchronization. In the case of coexistence of multiple synchronization modes, the synchronization mechanism of the whole power system will be fundamentally changed; at the same time, due to the response characteristics of wind turbine to the frequency and voltage dynamics of power grid and the traditional power supply, the synchronous mode of wind turbine will gradually become one of the main modes of system synchronization The frequency and voltage stability of power system also faces new challenges. The virtual synchronous generation technology can make the grid connected inverter simulate the operation mechanism of step generator and provide an effective method to solve the above problems. In this paper, the main technical routes to realize virtual synchronous control of wind turbines are summarized. From the aspects of stability analysis, control system optimization, performance analysis and evaluation, the research and engineering status of virtual synchronization technology in wind turbines are introduced, and the problems to be solved and technical requirements are prospected.

10.1016/j.egyr.2021.11.005

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Citations (3)